【简答题】听短文,对话和问题,选择正确答案。 1. How did the murderer get away? [ ] A. By car B. By truck C. By train 2. How old is John Smith? [ ] A. About 19 B. About 28 C. About 29 3. How did Henry find his seat? [ ...
【单选题】Finding her car stolen, _____.
A.
a policeman was asked to help
B.
the area was searched thoroughly
C.
it was looked for everywhere
D.
she hurried to a policeman for help
【简答题】接待“三声”是指()A. A:来有迎声; B. B:问有答声 ; C. C:去有送声; D. D:见有笑声;
【单选题】下列关于Maxam及Gilbert的DNA序列分析法原理的叙述,错误的是( )
B.
用不同的化学试剂分别裂解四种不同的脱氧核糖核苷酸
C.
用PAGE凝胶电泳将DNA裂解片段按分子大小分离开
【单选题】曲轴正时齿轮和凸轮轴正时齿轮的传动比是( )